Product Overview
The VQ31 series thermal conductivity gas detector elements are designed for detecting gases in 0-100% by volume concentrations. Utilizing the thermal conductivity principle, these elements feature a sensing element exposed to the atmosphere under test and a reference element sealed in reference air. The response is based on the difference in thermal conductivity between the test atmosphere and reference air, leading to a change in the sensing element's resistance due to heat loss. The VQ31M is supplied with braided leads, while the VQ31MB has extended pins for direct PCB fitting. These sensors are suitable for operation in various mounting arrangements, including direct flow or diffusion conditions.
Product Attributes
- Brand: SGX Sensortech
- Series: VQ31
- Operating Principle: Thermal Conductivity
- Element Identification: Serial number (red on sensing, black on reference), red circular label on sensing element base.
Technical Specifications
| Specification | Details |
|---|---|
| Operation | Continuous |
| Bridge Supply Voltage | 2.0 to 3.5 V |
| Bridge Power Consumption (at 3.5 V) | 0.35 W max |
| Bridge Power Consumption (at 2.0 V) | 0.28 W |
| Typical Response to Methane in Air (at 3.5 V) | 2.5 mV/% (open-circuit conditions at bridge output) |
| Typical Response to Methane in Air (at 2.0 V) | 1.0 mV/% (open-circuit conditions at bridge output) |
| Response Time | Function of mounting type |
| Shock Test | 250 g, 5 blows in each plane |
| Vibration Test | 20 g, 24 cycles from 100 to 3200 Hz |
| VQ31M Outline Dimensions (A) | 11.05 + 0.25 mm |
| VQ31M Outline Dimensions (B) | 6.10 + 0.25 mm |
| VQ31M Outline Dimensions (C) | 3.56 + 0.13 mm |
| VQ31M Outline Dimensions (D) | 63.5 min mm |
| VQ31M Outline Dimensions (E) | 1.0 mm |
| VQ31M Outline Dimensions (F) | * (sensing element 6.25 + 0.50 mm, reference element 7.75 + 0.38 mm) |
| VQ31M Outline Dimensions (G) | 8.2 max mm |
| VQ31M Outline Dimensions (H) | 9.53 mm |
| VQ31M Outline Dimensions (J) | 1.5 mm |
| VQ31MB Outline Dimensions (A) | 11.05 + 0.25 mm |
| VQ31MB Outline Dimensions (B) | 6.10 + 0.25 mm |
| VQ31MB Outline Dimensions (C) | 3.56 + 0.13 mm |
| VQ31MB Outline Dimensions (D) | 40.0 min mm |
| VQ31MB Outline Dimensions (E) | 1.0 mm |
| VQ31MB Outline Dimensions (F) | * (sensing element 6.25 + 0.50 mm, reference element 7.75 + 0.38 mm) |
| VQ31MB Outline Dimensions (G) | 8.2 max mm |
| VQ31MB Outline Dimensions (H) | 1.5 mm |
| Recommended Mounting Arrangement (AA) | 9.53 + 0.13 mm |
| Recommended Mounting Arrangement (AB) | 8.33 + 0.13 mm |
| Recommended Mounting Arrangement (AC) | 8.20 min mm |
| Recommended Mounting Arrangement (AD) | 9.53 + 0.13 mm |
| Recommended Mounting Arrangement (AE) | 8.20 min mm |
| Order Code: VQ31 | Flexi-leg sensor with open compensator can. Compensator requires mounting in a sealed chamber filled with air or nitrogen. |
| Order Code: VQ31B | PCB legged sensor with open compensator can. Compensator requires mounting in a sealed chamber filled with air or nitrogen. |
| Order Code: VQ31M | Flexi-leg sensor with sealed compensator can. |
| Order Code: VQ31MB | PCB legged sensor with sealed compensator can. |
Note: Thermal conductivity of gases relative to air is tabulated at various temperatures (0C to 600C).
2411261541_Amphenol-VQ31MB_C1526433.pdf
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